| Summary: | [Arrandale LVDS] U160 LVDS fails | ||||||
|---|---|---|---|---|---|---|---|
| Product: | DRI | Reporter: | Rasmus Thytrup Karstensen <rathka> | ||||
| Component: | DRM/Intel | Assignee: | Chris Wilson <chris> | ||||
| Status: | CLOSED FIXED | QA Contact: | |||||
| Severity: | normal | ||||||
| Priority: | medium | CC: | jbarnes | ||||
| Version: | unspecified | ||||||
| Hardware: | x86-64 (AMD64) | ||||||
| OS: | Linux (All) | ||||||
| Whiteboard: | |||||||
| i915 platform: | i915 features: | ||||||
| Bug Depends on: | |||||||
| Bug Blocks: | 34437 | ||||||
| Attachments: |
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The infamous U160.
This will fix it, but I cannot explain why:
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios
index fb5b4d4..53ff16f 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -267,7 +267,7 @@ static int intel_bios_ssc_frequency(struct drm_device *dev,
case 4:
return alternate ? 100 : 96;
default:
- return alternate ? 100 : 120;
+ return alternate ? 120 : 100;
}
}
This fix works for 2.6.39, solved my issues with lid close and suspension - THX Keith Packard recently added a 'disable SSC' quirk to the i915 driver, with the U160 currently configured to have SSC automatically disabled: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=435793dfb8aec7b2e19f72d5bce8a22fd0b57839 It's now in Linus' tree, so this bug could be closed once the next Linux release is out? This patch is part of Linux 3.0 A patch referencing a commit referencing this bug report has been merged in Linux v3.1-rc1: commit 070d329ae52e2fde341771d753a5b728145881f4 Author: Michel Alexandre Salim <salimma@fedoraproject.org> Date: Thu Jul 28 18:52:06 2011 +0200 drm/i915: Add quirk to disable SSC on Sony Vaio Y2 |
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Created attachment 46138 [details] config files for kernel 2.6.38.3 and 2.6.39-rc4 uname -a: Linux loki 2.6.38-gentoo-r3 #1 SMP Thu Apr 28 10:01:00 CEST 2011 x86_64 Intel(R) Core(TM) i5 CPU U 470 @ 1.33GHz GenuineIntel GNU/Linux This bug is for the i915 driver in linux kernel, it exists with and without xorg running. I hope this is the right place for this bug, if not please point me in the right direction. Before kernel 2.6.38 I had no output to LVDS on my new laptop (lenovo ideapad u160), however HDMI worked fine. With 2.6.38 I got output to LVDS (tested with kernel 2.6.38.3 both with and without gentoo patchset), but experienced the following problem: after lid close/open action or suspend/resume action, LVDS stays blank and a reboot is needed. The system does not hang, it reboots correctly on ctrl+alt+del or is shutdown by acpid on power-button events. Trying 2.6.39-rc4 from git, I do not get output to LVDS again. attaching kernel configs! happy to provide more info if needed