#21 2017-02-23 20:13:56

stevep

MX Linux Developer

Registered: 2016-08-08

Posts: 381

Re: [SOLVED]Unable to adjust screen brightness

Glxgears is matching your screen's refresh rate of 60 Hz--a feature, not a bug!

Run this to disable that:

vblank_mode=0 glxgears

Though I like the glxspheres(64) benchmarker provided by the virtualgl package, myself. Glxgears reports a much smaller fps for my discrete Nvidia GPU vs. the Intel--glxspheres reports about 25% more throughput, which roughly matches what the reviews of my laptop on Youtube for Windows also report.  Virtualgl is in the MX 15 test repository at the moment:  http://main.mepis-deb.org/mx/testrepo/p … virtualgl/

Edit:  I found that the equivalent command for the proprietary Nvidia driver is

__GL_SYNC_TO_VBLANK=0

so that

__GL_SYNC_TO_VBLANK=0 optirun glxinfo

gives better results for my Bumblebee-nvidia system.

Last edited by stevep (2017-02-23 20:41:32)

Head_on_a_Stick

Member

From: London

Registered: 2015-09-29

Posts: 9,093

Website

Re: [SOLVED]Unable to adjust screen brightness

I start to notice some weird behavior: if I tried to delete some characters if this very line, as the cursor moves backward, it prints itself behind or just back or the whole line gets mess up but after switching to a different window and going back to it everything is alright or even if I tried to take a screenshot image get back to normal.

Check the acceleration method in use:

grep -i 'uxa\|sna' /var/log/Xorg.0.log

If that shows UXA then switch to SNA acceleration with this method:

https://forums.bunsenlabs.org/viewtopic … 228#p45228

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Para todos todo, para nosotros nada

stevep

MX Linux Developer

Registered: 2016-08-08

Posts: 381

Re: [SOLVED]Unable to adjust screen brightness

You should also start a separate thread for Bumblebee, but you didn't really follow the wiki instructions exactly for installing it, as it said to install bumblebee-nvidia if you were using the proprietary Nvidia driver, and you said you just installed "bumblebee". Also, you left off the "-t backports" part of the command to get the backports version.