Opened 13 years ago
Last modified 13 years ago
#8154 new bug
Garbled display on iMac (Radeon HD 6750M)
| Reported by: | jonas.kirilla | Owned by: | kallisti5 |
|---|---|---|---|
| Priority: | normal | Milestone: | R1 |
| Component: | Drivers/Graphics/radeon_hd | Version: | R1/Development |
| Keywords: | Cc: | ||
| Blocked By: | #8329 | Blocking: | |
| Platform: | All |
Description
The desktop comes up garbled with hrev43238 (gcc2hybrid, nightly image) on an iMac.
Chipset Model: AMD Radeon HD 6750M Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 512 MB Vendor: ATI (0x1002) Device ID: 0x6741 Revision ID: 0x0000 ROM Revision: 113-C2950H-170 EFI Driver Version: 01.00.544 Displays: iMac: Resolution: 1920 x 1080 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes Connection Type: DisplayPort
Attachments (3)
Change History (16)
by , 13 years ago
| Attachment: | DSC00003.JPG added |
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comment:1 by , 13 years ago
comment:3 by , 13 years ago
comment:4 by , 13 years ago
I tested with hrev43768 and the blue of the desktop wouldn't show up at all. Just a flash of white and then black.
FWIW: Mac OS X calls it an "AMD Radeon HD 6750M 512 MB" whereas Haiku thinks it's either HD 6600M or 6650M.
by , 13 years ago
| Attachment: | syslog.txt added |
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by , 13 years ago
| Attachment: | listdev.txt added |
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comment:8 by , 13 years ago
No change with hrev43810. Just a brief fully white screen and then black.
comment:9 by , 13 years ago
lol.. sigh. I have the exact same card now in my testing arsenal... and it works.
I'm still betting this one is due to the iMac one-offs needed. I'll see if I can figure something out.
Exactly what kind of iMac is this?
comment:10 by , 13 years ago
The model identifier is "iMac12,1". It's the 21.5 inch one from summer 2011. (Core i5, 2,5 GHz)
Some info from OS X: (Translated from Swedish.)
AMD Radeon HD 6750M: Circuit model: AMD Radeon HD 6750M Type: Videoprocessor Bus: PCIe PCIe-bandwidth: x16 VRAM (total): 512 MB Maker: ATI (0x1002) Unit-ID: 0x6741 Revision-ID: 0x0000 ROM-revision: 113-C2950H-170 EFI-driverversion: 01.00.544 Monitors: iMac: Resolution: 1920 x 1080 Color depth: 32 bit color (ARGB8888) Primary screen: Yes Screen doubling: Off Connected: Yes Built-in: Yes Connection: DisplayPort
So maybe it's the internal DisplayPort connection that's different. Or something related to EFI.
comment:11 by , 13 years ago
try hrev43900... it solves several garbled screen issues.
Let me know your results :)
comment:12 by , 13 years ago
| Summary: | Garbled display on AMD Radeon HD 6750M → Garbled display on iMac (Radeon HD 6750M) |
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comment:13 by , 13 years ago
No visual change.
The bug report title is wrong though; there is no garbledness to be seen, as the screen goes black, as it has done for quite some time. I'm starting to doubt whether the attached garbled screenshot is driven by radeon or, if possible, a shot of garbled vesa that I mistook for radeon.
Definitely looks like a pixel clock issue.
The iMac's have lots of special unicorn one-off adjustments (many of which I haven't ported over yet)
This plus the display port is kind of a double whammy. Could we get the system logs from the boot attempt? You may be able to press and hold ctl+alt+delete for 4 seconds once the system loads to force a clean shutdown / reboot which will ensure the syslogs (/common/var/log/syslog) are written to your boot disk. (which I hope is a USB stick and not a CD)