[Bug 77521] New: radeon: Horizontal lines of semi-random contents are sometimes displayed

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=77521

            Bug ID: 77521
           Summary: radeon: Horizontal lines of semi-random contents are
                    sometimes displayed
           Product: Drivers
           Version: 2.5
    Kernel Version: drm-next-3.16-wip
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: g02maran at gmail.com
        Regression: No

Created attachment 138491
  --> https://bugzilla.kernel.org/attachment.cgi?id=138491&action=edit
dmesg

I checked out http://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-3.16-wip
(latest commit: 2472aac90b339e7abc186b615bcf533463b4c63a) and noticed that
sometimes 2-3 cm wide horizontal lines would show up on the screen. They would
only stay for a fraction of a second, before disappearing again. It's quite
easy to trigger them by using the gnome expose function (the window overview).
But they don't show up if I just let the computer idle at the desktop. I have a
radeon 6950.

I bisected the issue to this commit:
fa7f517cb26eb1a1a1f0baffcced39f6c3ec3337 drm/radeon: rework page flip handling
v4

I also noticed the following message (which is repeated multiple times):

[ 8346.287462] WARNING: CPU: 1 PID: 342 at drivers/gpu/drm/drm_crtc.c:4315
drm_mode_page_flip_ioctl+0x2fd/0x320 [drm]()
[ 8346.287464] Modules linked in: fuse snd_hda_codec_realtek
snd_hda_codec_generic radeon i2c_algo_bit drm_kms_helper ttm iTCO_wdt
iTCO_vendor_support snd_hda_codec_hdmi drm eeepc_wmi nls_cp437 asus_wmi
sparse_keymap mxm_wmi vfat fat x86_pkg_temp_thermal intel_powerclamp coretemp
kvm_intel evdev kvm crct10dif_pclmul crct10dif_common crc32_pclmul ecb btusb
ghash_clmulni_intel bluetooth aesni_intel crc16 aes_x86_64 glue_helper lrw
rfkill gf128mul ablk_helper cryptd microcode psmouse serio_raw pcspkr i2c_i801
lpc_ich i2c_core mfd_core fan snd_hda_intel snd_hda_controller snd_hda_codec
snd_hwdep snd_pcm snd_timer video thermal snd e1000e mei_me ptp mei pps_core
shpchp wmi soundcore processor button btrfs xor raid6_pq sr_mod cdrom sd_mod
hid_generic usbhid hid ehci_pci ahci libahci xhci_hcd ehci_hcd libata
[ 8346.287529]  firewire_ohci crc32c_intel firewire_core crc_itu_t scsi_mod
usbcore usb_common
[ 8346.287538] CPU: 1 PID: 342 Comm: Xorg Tainted: G        W    
3.15.0-rc8-ARCH+ #12
[ 8346.287540] Hardware name: System manufacturer System Product Name/P8P67
PRO, BIOS 3602 11/01/2012
[ 8346.287542]  0000000000000009 ffff88020e96fd08 ffffffff814ecc2a
0000000000000000
[ 8346.287546]  ffff88020e96fd40 ffffffff81065e0d ffff88020e96fdf8
ffff880211958068
[ 8346.287550]  ffff88020a67cd80 ffff880211958018 0000000000000000
ffff88020e96fd50
[ 8346.287554] Call Trace:
[ 8346.287561]  [<ffffffff814ecc2a>] dump_stack+0x4d/0x6f
[ 8346.287566]  [<ffffffff81065e0d>] warn_slowpath_common+0x7d/0xa0
[ 8346.287569]  [<ffffffff81065eea>] warn_slowpath_null+0x1a/0x20
[ 8346.287577]  [<ffffffffa0f1fffd>] drm_mode_page_flip_ioctl+0x2fd/0x320 [drm]
[ 8346.287583]  [<ffffffffa0f0ea7b>] drm_ioctl+0x1db/0x5f0 [drm]
[ 8346.287591]  [<ffffffffa0f1fd00>] ? drm_mode_gamma_get_ioctl+0xf0/0xf0 [drm]
[ 8346.287602]  [<ffffffffa0fb104c>] radeon_drm_ioctl+0x4c/0x80 [radeon]
[ 8346.287607]  [<ffffffff811c6b48>] do_vfs_ioctl+0x2c8/0x4b0
[ 8346.287612]  [<ffffffff811d0dde>] ? __fget+0x6e/0xb0
[ 8346.287615]  [<ffffffff811c6db1>] SyS_ioctl+0x81/0xa0
[ 8346.287619]  [<ffffffff814fb16d>] system_call_fastpath+0x1a/0x1f
[ 8346.287622] ---[ end trace 7f747cd881a3fb9e ]---

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