On Fri, Sep 6, 2013 at 7:19 PM, David Herrmann <dh.herrmann@xxxxxxxxx> wrote: > On Fri, Sep 6, 2013 at 7:12 PM, Tom Gundersen <teg@xxxxxxx> wrote: >> On Fri, Sep 6, 2013 at 6:57 PM, David Herrmann <dh.herrmann@xxxxxxxxx> wrote: >>> ( 2 more mails and you might get the fbdev ML right ;) ) >> >> Modern technology... >> >>> - Is CONFIG_FB_EFI enabled? If not, please enable it and try again >>> (hint: CONFIG_FB_VESA doesn't hurt either) >> >> FB_EFI was enabled, FB_VESA was not, but I'll enable it. Out of >> interest, how could this affect the situation? If I understand >> correctly these drivers won't be loaded as long as simple-framebuffer >> is created, or am I missing something? > > In case you disable X86_SYSFB vesafb might still be used (I wasn't > sure you used efifb). And there might be some nasty Kconfig-select > logic that I overlooked (like FB_BOOT_VESA_SUPPORT).. Just to be sure. Ok. All is now enabled and the behavior is the same. >>> - Could you try the _same_ kernel config but disable CONFIG_X86_SYSFB. >>> This will avoid creating simple-fb devices and instead load efifb >>> again. Does efifb work? Does efifb print the same offsets as your >>> simplefb printk()? >> >> Yeah, efifb works fine, I'll double-check everything and note down the offsets. > > Just to be clear, efifb still with the new x86-sysfb infrastructure > works? Because I moved some efifb quirks from efifb.c to > x86/kernel/sysfb_efi.c. So even with CONFIG_X86_SYSFB=n the situation > is still different from pre-3.12. Turns out I must have messed up my initial testing (maybe I only tested with an old kernel on efifb). With the current kernel both X86_SYSFB=y (i.e., simplefb) and X86_SYSFB=n (i.e., efifb) are broken. Only when I log in and "modprobe i915" do I get an fbcon, before that the screen is black. For the record here is the relevant dmesg outputs (they appear to be ok): efifb: probing for efifb efifb: framebuffer at 0x90000000, mapped to 0xffffc90009b00000, using 4224k, total 4224k efifb: mode is 1366x768x32, linelength=5632, pages=1 efifb: scrolling: redraw efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0 simple-framebuffer simple-framebuffer.0: framebuffer at 0x90000000, mapped to 0xffffc90009b00000 simple-framebuffer simple-framebuffer.0: format=a8r8g8b8, mode=1366x768x32, linelength=5632 simple-framebuffer simple-framebuffer.0: fb0: simplefb registered! >>> - Are you sure that it's an simplefb problem? Please make sure fbcon >>> is enabled (could you attach your dmesg output?). You could also try >>> SSH'ing into the machine and starting some fbdev program (like X with >>> xf86-video-fbdev installed). Or does fbcon with efifb work? >> >> fbcon with efifb works fine (so I guess trying X is not necessary?). > > Yeah, if fbcon+efifb works, no need to test X. Scratch this, I'll have to do some more testing. I'll get back to you. -t -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
