[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 Martin Peres changed: What|Removed |Added Resolution|--- |MOVED Status|NEW

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #24 from James Cameron --- Thanks for asking, James. No, I've no progress to report since my previous comments here. I'm still using a local kernel on the affected machine, and haven't had time to resolve the outstanding questions

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #23 from jamesstewartmil...@gmail.com --- Thanks, I thought that the display size was incorrect, but I have since seen how the size is calculated. -- You are receiving this mail because: You are the assignee for the

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #22 from Michel Dänzer --- (In reply to jamesstewartmiller from comment #14) > I would guess that the edid is reported incorrectly, as the imac screen is > reported in the settings dialog as 'laptop'. FWIW, sounds rather like the

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #21 from jamesstewartmil...@gmail.com --- Created attachment 140768 --> https://bugs.freedesktop.org/attachment.cgi?id=140768=edit results.log from the ubuntu firmware checking tool from https://wiki.ubuntu.com/FirmwareTestSuite/

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #20 from jamesstewartmil...@gmail.com --- looks like the edid is fried. his is read-edid version 3.0.2. Prepare for some fun. Attempting to use i2c interface Only trying 6 as per your request. 256-byte EDID successfully retrieved

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #19 from jamesstewartmil...@gmail.com --- the generic is 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux -- You are receiving this mail because: You are the assignee for the

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #18 from jamesstewartmil...@gmail.com --- I am currently running a rt compiled kernel for audio use at the latest patch level, so 4.9.98, but I get the same problem on the generic installed kernel that is 4.17 I think. I'll check

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 jamesstewartmil...@gmail.com changed: What|Removed |Added CC|

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #16 from jamesstewartmil...@gmail.com --- Created attachment 140763 --> https://bugs.freedesktop.org/attachment.cgi?id=140763=edit xorg.0.log.old failed boot log -- You are receiving this mail because: You are the assignee for

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #15 from jamesstewartmil...@gmail.com --- Created attachment 140762 --> https://bugs.freedesktop.org/attachment.cgi?id=140762=edit xorg.0.log this is with the external screen attached. I've attached another file of xorg.0.log.old

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #14 from jamesstewartmil...@gmail.com --- I've attached a separate screen via the displayport, and the radeon driver loads and I get the second monitor as a secondary screen, from which I can access kscreen through the settings dialog

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #13 from jamesstewartmil...@gmail.com --- Did you have any luck with this? I have a late 2009 imac and on installing kubuntu 18.04 the radeon driver fails with a dark screen or defaults to vesa complaining - modprobe: ERROR: could

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #12 from James Cameron --- Great. Sounds like what I observed. I seem to recall there were two sysfs entries for brightness, and both were effective. I don't have automatic dimming enabled, so didn't notice a

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #11 from Justin Thiessen --- so with the reversions from comment 4 (some conflict resolution by hand necessary, but seemed straightforward), the radeon driver loads and the primary display gets initialized

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #10 from Justin Thiessen --- Thanks James - I'll give this a shot -- You are receiving this mail because: You are the assignee for the bug.___ xorg-driver-ati

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #9 from James Cameron --- Other than reverting the series in comment 4, I've no solution. Once I had that workaround, I was mostly happy. I wanted to find the underlying problem and upstream it, but ran out of

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #8 from Justin Thiessen --- Hi, I'm still seeing this issue with an iMac11,1 with the identical graphics (RV770/M98L [Mobility Radeon HD 4850]) This is with kubuntu 17.04: kernel: 4.10.0-32-generic

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #4 from James Cameron --- Tested 4.11.0-rc7 as-is, and drm.debug=0xe, display was flickering horizontal lines, and got PLL setup of; [drm:radeon_compute_pll_avivo [radeon]] 36 - 30, pll dividers - fb: 22.0

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 James Cameron changed: What|Removed |Added CC||qu...@laptop.org ---

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 Alex Deucher changed: What|Removed |Added Attachment #127003|text/x-log |text/plain

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #2 from Nicolas Jungers --- Created attachment 127003 --> https://bugs.freedesktop.org/attachment.cgi?id=127003=edit dmesg output on 16.04 -- You are receiving this mail because: You are the assignee for the

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 --- Comment #1 from Alex Deucher --- Please attach your dmesg output. Was it the firmware updates the caused the regression or an Ubunutu update? If it's an Ubuntu update, can you narrow down what update caused the

[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

https://bugs.freedesktop.org/show_bug.cgi?id=98046 Alex Deucher changed: What|Removed |Added Attachment #127000|text/x-log |text/plain