Created attachment 126586 [details] Eye strain in linux. Hi everyone, i come here to report a bug that is causing me a lot of problems. Let start, i have 3 pcs, a hp netbook, a desktop pc and a asus laptop, always i tried to install some linux that i wanna use in that time, so now i'm using Windows 8.1 why?Always i come to windows sadly by the same reason: EYE STRAIN. While in Windows i can stay for 10 hours using the pc, watching videos, reading pdf, drawing,etc.In any linux distro i can't stay half hour and my eyes stars feel like drying, i really annoying effect, its unbearable for me and i think that in a long time could be dangerous, so i investigate about the theme. The first that i found in internet was to use flu.x or redshift, sadly that doesn't work. The second was the refresh rate, i think that could be but modifying with xrandr doesn't gave goos results. The last info that i found was that the guilty in this case was the PWM,i suppose that is the problem i don't found more info. https://en.wikipedia.org/wiki/LED-backlit_LCD I found that linux use a really low pwm, so i tried to change it with the intel gpu tool, right i change i make the pen test and effectively the pwm solved, now the high brightness of the screen burn my eyes... I tried the pen test in windows and i found that in the pwm is low in lower brightness but i not cause my eye strain, so i really don't now what i could do more. You now a lot more about this so i really thank your help. I attached a pdf with the info about my screen, have a lot of stuff that i think that could be usefull.
Which kernel version are you using? Please attach /sys/kernel/debug/dri/0/i915_vbt. (Lacking that, /sys/kernel/debug/dri/0/i915_opregion.) Please add drm.debug=14 module parameter, and attach dmesg from boot. Please do a register dump using 'intel_reg dump' when you're experiencing the problem. If you can figure out how, please do an MMIO dump of the graphics PCI bar on Windows. I think there are tools for this, but I'm no Windows user.
I'm using 4.4 kernel, I don't found the i915_vbt and i915_opregion, I used a live distro(Ubuntu), maybe I can't install to see if the files appear. Can you explain me more about the register dump and the MMIO dump I don't understand how to use it. There is the Intel_reg dump paste: http://pastebin.ubuntu.com/23205444/ I will try to install again Linux for provide more info.
(In reply to ivan from comment #2) > I'm using 4.4 kernel, I don't found the i915_vbt and i915_opregion, I used > a live distro(Ubuntu), maybe I can't install to see if the files appear. You'll need to have debugfs mounted and probably need root access for them. > Can you explain me more about the register dump and the MMIO dump I don't > understand how to use it. > > There is the Intel_reg dump paste: > http://pastebin.ubuntu.com/23205444/ Please *attach* the information.
(In reply to Jani Nikula from comment #3) > (In reply to ivan from comment #2) > > I'm using 4.4 kernel, I don't found the i915_vbt and i915_opregion, I used > > a live distro(Ubuntu), maybe I can't install to see if the files appear. > > You'll need to have debugfs mounted and probably need root access for them. > > > Can you explain me more about the register dump and the MMIO dump I don't > > understand how to use it. > > > > There is the Intel_reg dump paste: > > http://pastebin.ubuntu.com/23205444/ > > Please *attach* the information. Like i see i have mounted the debugfs monted, i access with root and i still not found the i915_vbt and i915_opregion. I don't now if i'm making something wrong. I found that debugfs is mounted on my distro when i installed.
Created attachment 126684 [details] dmesg paste the dmesg paste. When you say of attach the file is this, right?, I'm new on this of report bugs.
Created attachment 126711 [details] intel_reg dump paste Intel reg paste.
(In reply to Jani Nikula from comment #1) > If you can figure out how, please do an MMIO dump of the graphics PCI bar on > Windows. I think there are tools for this, but I'm no Windows user. Wait, i'm using a laptop how i can do an MMIO dump of a pci bar if a laptop? I'm really new on this, i found that exist a software in windows called windbg, its the only that i found searching about MMIO dump.
Created attachment 126721 [details] DMESG with module parameter I can't use the dmesg command in the grub, but when i add the module parameter to the boot, the dmesg gave me different results. I hope that will be usefull.
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