Dear developers, I have the same problem as the one described by Michael bellow: the Intel Graphic card produces eye strain and headache after some minutes of using it. I found a lot of people complaining on the same problem, but no solution. I tried lowering the resolution, increasing the PWM frequency, but without luck. I also installed an old version of intel drivers (2.20.12), because the subject of this email was "with **new** Intel drivers", but it didn't help. I have a new HP Folio 9470m, with the Intel HD 4000 graphic card, and I cannot use it. Even when connecting an external monitor, I have the same problem. When I connect my old laptop, with an nvidia card, to the same monitor, the eyestrain disapear, so it must be the Intel card, or its driver. I will be glad to provide any information you consider relevant. I can do whatever test you want, but please, do not ignore this message. I am not the only one to have this problem: https://www.google.com/search?q=Eye+strain+Intel+graphic I am on (Arch) Linux, but I saw some reports on Windows too. Best, Alejandro On Mon, Jan 9, 2014 at 3:30 PM, Michael Vanier wrote: > Hi everyone, > > I recently got a new Macbook Pro, which I dual-booted into Ubuntu > 13.10 (Linux kernel 3.11). My previous computers were from 2008 and > used ATI or Nvidia graphics cards. The new one (with Intel HD 4000 > integrated graphics, core i7, no other graphics card) seems to cause > me a lot of eyestrain compared to what I'm used to. The experience I > have is that light surfaces appear to shimmer in a way that didn't > used to happen, and this shimmering seems to be related to the > eyestrain. After about an hour I really don't want to use the computer > anymore; it's like a burning/sore feeling in the eyes coupled with dry > eyes. It's not a monitor problem, because I can hook up the Macbook to > an old monitor which works perfectly well with old hardware (no > eyestrain) and the eyestrain is still there. So it would appear to be > due to the graphics hardware/driver combination. It's also not > Intel-specific or OS-specific; I've seen the same effect on Mac OS X > and using different video cards; it seems to be the new normal. I'm > really confused about what could be causing this. Resolutions don't > matter; you always get the eyestrain. My first thought was temporal > dithering (or spatiotemporal dithering), but my reading of the intel > driver source is that the kernel drivers have disabled ST dithering in > favor of spatial dithering. I have seen a few people report similar > problems in mailing lists (including this one), and some of them got > some relief by disabling the DRI/DRI2 extension in Xorg (this was > around 2010), which doesn't seem to do much for me (nor does switching > to the modesetting driver or fbdev driver). (Interestingly, using > modesetting/fbdev drivers doesn't seem to slow down glxgears either, > which always claims to run around 1700 FPS). Some people got relief by > switching to the Vesa driver, which my Xorg won't accept; it just > unloads it and reloads the Intel driver. Interestingly, the eyestrain > is present even before X loads up or if you don't load X at all; when > the system boots you can see very flat-looking text (which I think is > OK) and then it switches to a more shimmering kind of text (presumably > when the intel driver kicks in). You would think plain text would have > absolutely constant pixel values, but that isn't what I see (except on > old hardware). I'm sure that 99% of people can't notice this, but for > the 1% who can it's a huge pain. I'm on another mailing list with > dozens of other people with similar problems, so it isn't just me. If > anyone has any suggestions as to what I/we can try (not eyedrops, I > mean software stuff) or where I can look, I'd be really grateful. I've > had my eyes checked recently and they're fine. > > Thanks! > > Mike > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Alejandro Díaz-Caro http://diaz-caro.info _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
