Bug 23592
| Summary: | Radeon tries to execute atombios on a card powered off by vgaswitcheroo | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Javier S. Pedro (debbugs) |
| Component: | Video(DRI - non Intel) | Assignee: | Dave Airlie (airlied) |
| Status: | CLOSED CODE_FIX | ||
| Severity: | normal | CC: | airlied, alan, chris, florian |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.34+ | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
dmesg with added WARN_ON() on atom_execute_table_locked
attempt at fix by avoiding hitting the radeon driver. |
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Created attachment 53542 [details]
attempt at fix by avoiding hitting the radeon driver.
A patch referencing this bug report has been merged in v2.6.39-rc4: commit 0a0883c8433c743dad0a4d9ebe2717558f2c209e Author: Dave Airlie <airlied@redhat.com> Date: Tue Apr 5 17:57:23 2011 +1000 i915: restore only the mode of this driver on lastclose The attached patch also applied cleanly to 2.6.37 and worked for me. It is not marked as immediate stable backport. Please ping Dave Airlie (the drm maintainer) and Chris Wilson (i915) if this is already on it's way to the stable kernels. I actually reverted it for another patch that I'll get in really soon. A patch referencing a commit referencing this bug report has been merged in v2.6.39-rc4: commit 2582b6efceb43dce63b4a1090d289934067a972d Author: Dave Airlie <airlied@redhat.com> Date: Wed Apr 13 09:20:24 2011 +1000 Revert "i915: restore only the mode of this driver on lastclose" ( I updated my script... not sure if that is overdoing it though... :) ) |
Created attachment 37912 [details] dmesg with added WARN_ON() on atom_execute_table_locked During Xorg shutdown, dmesg gets filled with lots of repeating: [ 101.804993] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [ 101.805045] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CD0C (len 62, WS 0, PS 0) @ 0xCD28 Xorg does NOT terminate properly until after a handful of these messages, so the system takes a long time to shutdown. Steps to reproduce, on a Acer 5820TG (Intel Clarkdale+Radeon Evergreen switchable graphics): 1. Boot kernel with vgaswitcheroo enabled. 2. Start Xorg with no xorg.conf. Defaults to using Intel card. 3. While Xorg is running, echo OFF > /sys/kernel/debug/vgaswitcheroo/switch (powers off the Radeon card). 4. Try to quit Xorg (either by SIGTERM or Zap key sequence). Expected result: Xorg quits in a few seconds Actual results: Lots of messages on dmesg, Xorg takes minutes to die. For convenience, I added a WARN_ON() on atom_execute_table_locked() right where it printks the above warning message. The resulting backtrace is attached. Seemingly, drm_helper_disable_unused_functions is called by the Intel driver which ends up calling some Readeon DPMS functions (atombios_crtc_disable) which eventually try to run Atombios code while rdev->powered_down is TRUE. A trivial workaround is to patch atombios_crtc_disable and do nothing if rdev->powered_down is TRUE. That works for me but I don't really know if it's exactly the ideal solution.