Re: Regression: Screen turns off when booting in EFI mode

From: Mantas MikulÄnas
Date: Tue Mar 19 2013 - 15:31:46 EST

On 2013-03-19 19:09, Linus Torvalds wrote:
> This is apparently still outstanding, and Mantas hadn't cc'd the
> people involved with the commit itself.

I completely forgot about that â sorry.

> Mantas, mind changing that "pcibios_add_device()" function so that
> instead of setting dev->rom/romlen, it just prints out the values
> (including the device address)? Plase also make it print out the
> "data->len" field in addition to the rom->xyz fields..

Which variable is the device address stored in? I'm mostly clueless
about the kernel beyond adding printk's, unfortunately.

But I tried printing out the other values, and this is what I have so far:

For 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices
[AMD] nee ATI Robson CE [AMD Radeon HD 6300 Series] [1002:68e4]

pci 0000:01:00.0: [1002:68e4] type 00 class 0x030000
pci 0000:01:00.0: reg 10: [mem 0xc0000000-0xcfffffff 64bit pref]
pci 0000:01:00.0: reg 18: [mem 0xd0020000-0xd003ffff 64bit]
pci 0000:01:00.0: reg 20: [io 0xd000-0xd0ff]
pci 0000:01:00.0: reg 30: [mem 0xd0000000-0xd001ffff pref]
pci 0000:01:00.0: supports D1 D2
(dbg) -------------------------------------
(dbg) old dev->rom: 0x0000000000000000, dev->romlen: 0
(dbg) new dev->rom: 0x00000000029ad058, dev->romlen: 61952
(dbg) pa_data: 0x00000000029ad018 + offset: 64
(dbg) data->type: 3, data->len: 62000
(dbg) rom->segment: 0, rom->bus: 1
(dbg) rom->device: 0, rom->function: 0
(dbg) rom->vendor: 1002, rom->devid: 68e4 <-- radeon
(dbg) -------------------------------------

And for 05:00.5 Ethernet controller [0200]: JMicron Technology Corp.
JMC250 PCI Express Gigabit Ethernet Controller [197b:0250] (rev 03) â
haven't checked if it's affected too, but including anyway.

pci 0000:05:00.5: [197b:0250] type 00 class 0x020000
pci 0000:05:00.5: reg 10: [mem 0xd0200000-0xd0203fff]
pci 0000:05:00.5: reg 18: [io 0x9100-0x917f]
pci 0000:05:00.5: reg 1c: [io 0x9000-0x90ff]
pci 0000:05:00.5: PME# supported from D0 D3hot D3cold
(dbg) -------------------------------------
(dbg) old dev->rom: 0x0000000000000000, dev->romlen: 0
(dbg) new dev->rom: 0x00000000029bd058, dev->romlen: 40960
(dbg) pa_data: 0x00000000029bd018 + offset: 64
(dbg) data->type: 3, data->len: 41008
(dbg) rom->segment: 0, rom->bus: 5
(dbg) rom->device: 0, rom->function: 5
(dbg) rom->vendor: 197b, rom->devid: 250
(dbg) -------------------------------------
pci 0000:05:00.5: System wakeup disabled by ACPI

Mantas MikulÄnas <grawity@xxxxxxxxx>
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at