From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jani Nikula Subject: Re: i915+UEFI+Intel 9600M on Toshiba Date: Tue, 14 Jan 2014 17:39:10 +0200 Message-ID: <87sisqpo81.fsf@intel.com> References: <3f1808d56f111d35e3a48d0a89a600c2@animeka.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <3f1808d56f111d35e3a48d0a89a600c2@animeka.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org To: cyrille@enialis.net, Daniel Vetter Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org On Fri, 10 Jan 2014, Cyrille Pontvieux 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