Difference between revisions of "Hardware: HP EliteBook Revolve 810 G1 with Ubuntu Linux - problems"

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'''Attention: this page is work in progress.'''
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'''Warning:''' I no longer use this laptop as my primary device (April 2016). Therefore this page is no longer maintained and may become outdated.
  
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This page describe problems observed with "HP EliteBook Revolve 810 G1" during regular usage or tests.
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== Wireless ==
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There is something wrong with WiFi scanning or network manager implementation. When I log in then device scan for networks and connect to my home WiFi. If there is need to do scanning again (for example when I move laptop to different place) then it looks like scanning is not invoked at all. GUI show stale entries and connection is not established.
  
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This page describe problems observed with "HP EliteBook Revolve 810 G1" during regular usage or tests.
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Workaround:
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== Touch Screen ==
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<pre>sudo iwlist wlan0 scanning | grep SSID</pre>
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<strike>After boot-up touch screen is working fine, but is generating only "left click" of mouse. This is limiting usage. After some time of usage only "mouse movement" events are generated. Same problem I saw also on Nexus 7 running Ubuntu Desktop. Looks like driver problem, but till now i don't have enough time to debug.</strike>
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Sometimes it is necessary to invoke this command twice. Then suddenly GUI found WiFi and connect to it.
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I think network manager is not invoking scanning properly but it will need more in depth investigation.
  
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I recently updated to 13.10. version of Ubuntu. I had time to debug problem with touch panel but while I was trying to do so I realized that is is gone. I was drawing picture in gimp for several hours and it was working fine. Multi-touch is still not supported but this is limitation of X11 system (it was designed for PC with KB/Mouse input).
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== Graphics ==
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Additionally from time to time network manager is not started at all.  
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HW acceleration is working fine. Resolution change, monitor select, etc. is working also fine, but i saw few times artifacts on screen. Looks like GPU is restarting itself at certain moment which cause artifacts to pop up for very short moment. Occurrence is very rare and this is not causing problems.
 
  
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== Wireless ==
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Workaround:
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For regular usage WiFi is working fine, but ... When notebook is running on battery power save is high aggressive. For web browsing it is fine, but for interactive sessions (ssh, chat) it is causing visible delay. With power save active also maximal throughput is limited which can affect video on demand.
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<pre>sudo service network-manager restart</pre>
  
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Power save can be disabled by <code>powertop</code> application or by connecting notebook to AC. Maybe there is way how to disable this permanently ... I'll check it later.
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This is again pointing to network manager. More in depth check needed.
  
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== WWAN ==
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=== USB ===
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Modem is detected by Linux kernel properly and also by Network Manager within Ubuntu. Ubuntu is reporting signal strength correctly but attempt to connect to internet will fail. Looks like modem don't like way how Ubuntu initialize it and as result it reset itself.
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This laptop have two USB ports. One is equipped with offline charge capability (e.g. you shut down laptop and you can still charge connected device). There is configuration option in BIOS which can configure cut-off percentage of battery. When battery capacity drop under this percentage then output is cut-off (to preserve power for laptop itself). Default configuration is 10%. I configured 50%. This port have following problem:
  
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Special initialization sequence is necessary prior to connection using network manager
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There is power glitch on USB port equipped with offline charge capability when charge level of main battery cross threshold. This can be during discharge of main battery or during recharge from mains.
  
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... TODO: finish this section
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This glitch cause restart of connected device. It may not be noticeable for HID and other kind of devices but cause file system corruption on USB Flash and HDD devices.
  
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== GPS ==
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Workaround:
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* Use second USB port for devices which should not lose power during operation.
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* Disable feature in BIOS
  
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... TODO: finish this section
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It is not mentioned in BIOS release notes but I try to update bios to see if this help.

Latest revision as of 21:42, 1 May 2016

Warning: I no longer use this laptop as my primary device (April 2016). Therefore this page is no longer maintained and may become outdated.

This page describe problems observed with "HP EliteBook Revolve 810 G1" during regular usage or tests.

Wireless

There is something wrong with WiFi scanning or network manager implementation. When I log in then device scan for networks and connect to my home WiFi. If there is need to do scanning again (for example when I move laptop to different place) then it looks like scanning is not invoked at all. GUI show stale entries and connection is not established.

Workaround: 

sudo iwlist wlan0 scanning | grep SSID

Sometimes it is necessary to invoke this command twice. Then suddenly GUI found WiFi and connect to it.

I think network manager is not invoking scanning properly but it will need more in depth investigation.

Additionally from time to time network manager is not started at all.

Workaround: 

sudo service network-manager restart

This is again pointing to network manager. More in depth check needed.

USB

This laptop have two USB ports. One is equipped with offline charge capability (e.g. you shut down laptop and you can still charge connected device). There is configuration option in BIOS which can configure cut-off percentage of battery. When battery capacity drop under this percentage then output is cut-off (to preserve power for laptop itself). Default configuration is 10%. I configured 50%. This port have following problem:

There is power glitch on USB port equipped with offline charge capability when charge level of main battery cross threshold. This can be during discharge of main battery or during recharge from mains.

This glitch cause restart of connected device. It may not be noticeable for HID and other kind of devices but cause file system corruption on USB Flash and HDD devices.

Workaround:

  • Use second USB port for devices which should not lose power during operation.
  • Disable feature in BIOS

It is not mentioned in BIOS release notes but I try to update bios to see if this help.

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