Bug#766922: xserver-xorg-video-radeon: resume from suspend/hibernate results in blank screen kernel > 3.16

[Jonas Smedegaard <dr@jones.dk>]

Hi,

Should this perhaps be reassigned to the linux kernel, since it seems 
tied to changes in kernel rather than in Xorg code?

I experience what seems to be this same bug, on two quite similar 
laptops:

Acer Aspire One 725 C6Ckk:

  lspci: [AMD/ATI] Wrestler [Radeon HD 6290]
  Xorg: "AMD Radeon HD 6200 Series Graphics" (ChipID = 0x9807)

Acer Aspire One 725 C7Xkk:

  lspci: [AMD/ATI] Wrestler [Radeon HD 7290]
  Xorg: "PALM" (ChipID = 0x980a)

Most recent working unstable/testing kernel is linux-image-3.14-2-amd64 
3.14.15-2 - and problem goes away with the experimental 
linux-image-3.19.0-trunk-amd64 3.19-1~exp1.


Here's a diff of Xorg logs from boot till after a sleep and wakeup 
comparing working and broken kernels, trimmed to leave out seemingly 
irrelevant info:

--- 3.14.2/post-sleep/dmesg.
+++ 3.18.0/post-sleep/dmesg.
@@ -1,8 +1,9 @@
-Linux version 3.14-2-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.3 (Debian 4.8.3-7) ) #1 SMP Debian 3.14.15-2 (2014-08-09)
+Linux version 3.18.0-trunk-amd64 (debian-kernel@lists.debian.org) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP Debian 3.18.5-1~exp1 (2015-01-31)
+ACPI: Early table checksum verification disabled
-ACPI: IRQ2 used by override.
-nr_irqs_gsi: 40
-NR_IRQS:33024 nr_irqs:712 16
+NR_IRQS:33024 nr_irqs:456 0
+Initializing cgroup subsys net_prio
-tlb_flushall_shift: 6
+ftrace: allocating 21993 entries in 86 pages
-bio: create slab <bio-0> at 0
-ACPI: No dock devices found.
+vgaarb: setting as boot device: PCI:0000:00:01.0
-ACPI: bus type PNP registered
-pnp 00:01: Plug and Play ACPI device, IDs PNP0103 (active)
-pnp 00:02: [dma 4]
-pnp 00:02: Plug and Play ACPI device, IDs PNP0200 (active)
-pnp 00:03: Plug and Play ACPI device, IDs PNP0c04 (active)
-pnp 00:05: Plug and Play ACPI device, IDs PNP0800 (active)
-pnp: PnP ACPI: found 10 devices
+pnp: PnP ACPI: found 6 devices
-ACPI: bus type PNP unregistered
-pci 0000:00:01.0: Boot video device
+pci 0000:00:01.0: Video device with shadowed ROM
+zpool: loaded
+ledtrig-cpu: registered to indicate activity on CPUs
+radeon 0000:00:01.0: radeon: MSI limited to 32-bit
-bio: create slab <bio-1> at 1
+Process accounting resumed
+rtc_cmos 00:01: System wakeup disabled by ACPI


Tell me if useful that I produce similar against working 3.19 kernel, or 
if some other info is helpful.


 - Jonas

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