Bug 16552 - No wakeup after Suspend to RAM
Summary: No wakeup after Suspend to RAM
Alias: None
Product: Power Management
Classification: Unclassified
Component: Hibernation/Suspend (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: power-management_other
Depends on:
Blocks: 7216
  Show dependency tree
Reported: 2010-08-10 07:18 UTC by josef
Modified: 2011-03-03 01:15 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.35
Tree: Mainline
Regression: Yes


Description josef 2010-08-10 07:18:11 UTC
A suspend regression seems to have slipped in between kernel ~ and ~, approximated from the Debian distribution versions linux-image-2.6.32-3-amd64 and linux-image-2.6.32-5-amd64.  The regression is still present with the latest 2.6.35 kernels. It causes the system to not properly wake up again after a suspension to RAM. The screen remains black, and Ctrl+Alt+Del doesn't work anymore either.

According to the debugging instructions in basic-pm-debugging.txt, the isolation tests were performed with s2ram -f on a 2.6.35 recovery system with only init, bash and udev running. Configuring /sys/power/pm_test to "freezer" works, whereas configuring it to "devices" already causes the problem.

# s2ram --identify
This machine can be identified by:
    sys_vendor   = "System manufacturer"
    sys_product  = "System Product Name"
    sys_version  = "System Version"
    bios_version = "1006   "
See http://suspend.sf.net/s2ram-support.html for details

The bug happens even with the following reduced module list. The Radeon modules cannot be removed even in console mode, the others seem to be fairly standard low-level modules.

Module                  Size  Used by
fuse                   57937  1
radeon                692822  1
ttm                    56623  1 radeon
drm_kms_helper         26939  1 radeon
drm                   180695  3 radeon,ttm,drm_kms_helper
i2c_algo_bit            4914  1 radeon
i2c_core               22507  4 radeon,drm_kms_helper,drm,i2c_algo_bit
ext3                  112373  3
jbd                    44134  1 ext3
mbcache                 7044  1 ext3
sd_mod                 32903  5
crc_t10dif              1515  1 sd_mod
ata_generic             3411  0
ahci                   20381  0
libahci                20639  5 ahci
libata                168236  3 ata_generic,ahci,libahci
scsi_mod              183302  2 sd_mod,libata

The original bug report contains reference information regarding the hardware specs and previous discussion.
Comment 1 josef 2010-08-21 11:07:02 UTC
The bug seems to vanish when the Debian package firmware-linux-nonfree is installed. This seems to be a Debian packaging issue so I will give more details in the distribution-specific bug report.

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