On Fri, 10 Jan 2014, Cyrille Pontvieux <cyrille@xxxxxxxxxxx> wrote: > I recently acquired a Toshiba laptop with a Intel Graphics 4600M in it > (8086:0416, subsystem 1179:fa82). > This Toshiba system is provided with UEFI (EFI Insyde H2O 1.30). > I compiled and use Linux kernel 3.13-rc7 (config.gz attached) > This system is provided with Windows 8.1 OS and the gpu is working fine > under it. > If I boot the laptop and Linux in BIOS compatible mode, gpu is working ok. > If I boot the laptop and Linux in UEFI, there is strange problems on > pixels rendering, both in the console (framebuffer) and in Xorg. > The problem is that the colors are not "right" depending on the position > of the pixel on the screen. For example, on white-on-black text, the > white text is never rendered white but with an alternance of red, green, > blue (cyan ?) and magenta pixels. If you look far enough, it looks > white. There also appear to have maybe one pixel shifting or bluring, > hard to tell. > I also attached a photo to better explain the problem. > > The problem is exactly the same in framebuffer console or in Xorg. > It appears early in the boot process. Before that the rendering is > correct. Linux penguins are show correctly before a screen reset is done > and the problem appears. > I also attached the output of dmesg for that case. > > If I boot by disabling KMS (with nomodeset), the rendering is ok in > Linux console, but I cannot run Xorg: > (EE) open /dev/dri/card0: No such file or directory > (EE) VESA(0): V_BIOS address 0x0 out of range > (EE) Screen(s) found, but none have a usable configuration. > But maybe this is a separate problem and I need to compile newer intel > Xorg drivers (mine is 2.21.15). > I also attached the output of dmesg for that case. > > I could provide more input, or compile a custom/patched kernel to help > correcting the problem. > One more thing: contrary to what occurs recently with some i915 driver > users, my gpu never hangs. This bug is tracked at https://bugzilla.kernel.org/show_bug.cgi?id=68651 -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
