Bug 885

Summary:	neofb has issue with scrollback
Product:	Drivers	Reporter:	Leslie Donaldson (donaldlf)
Component:	Console/Framebuffers	Assignee:	James Simmons (jsimmons)
Status:	REJECTED INSUFFICIENT_DATA
Severity:	normal	CC:	bunk, nacc
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.5.74	Subsystem:
Regression:	---	Bisected commit-id:

Description Leslie Donaldson 2003-07-07 11:52:26 UTC

Distribution: redahat 7.2
Hardware Environment: son vaio (PCG-F490) intel laptop
Software Environment:Redhat
Problem Description:
1. When booting no penguin :(
2. After dumping a large section of text to the screen (console mode)
   the frame buffer moves it's virtual window to the top of the buffer.
   A switch between virtual consoles brings it back correctly.
3. On a side note, compile time options for selecting external output would be 
   cool because it dosen't listen to module arguments when compiled in...

Info follows:

#
# Graphics support
#
CONFIG_FB=y
# CONFIG_FB_CIRRUS is not set
# CONFIG_FB_PM2 is not set
# CONFIG_FB_CYBER2000 is not set
# CONFIG_FB_IMSTT is not set
# CONFIG_FB_VGA16 is not set
# CONFIG_FB_VESA is not set
CONFIG_VIDEO_SELECT=y
# CONFIG_FB_HGA is not set
# CONFIG_FB_RIVA is not set
# CONFIG_FB_I810 is not set
# CONFIG_FB_MATROX is not set
# CONFIG_FB_RADEON is not set
# CONFIG_FB_ATY128 is not set
# CONFIG_FB_ATY is not set
# CONFIG_FB_SIS is not set
CONFIG_FB_NEOMAGIC=y
# CONFIG_FB_3DFX is not set
# CONFIG_FB_VOODOO1 is not set
# CONFIG_FB_TRIDENT is not set
# CONFIG_FB_PM3 is not set
# CONFIG_FB_VIRTUAL is not set

#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
# CONFIG_MDA_CONSOLE is not set
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_PCI_CONSOLE=y
# CONFIG_FONTS is not set
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y

#
# Logo configuration
#
CONFIG_LOGO=y
CONFIG_LOGO_LINUX_MONO=y
CONFIG_LOGO_LINUX_VGA16=y
CONFIG_LOGO_LINUX_CLUT224=y

dmesg info:

ory: 256672k/262080k available (1317k kernel code, 5020k reserved, 525k data,
96k init, 0k highmem)
Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)
Inode cache hash table entries: 16384 (order: 5, 131072 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 16384 (order: 4, 65536 bytes)
Page-cache hash table entries: 65536 (order: 6, 262144 bytes)
CPU: L1 I cache: 16K, L1 D cache: 16K
CPU: L2 cache: 256K
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU:     After generic, caps: 0383f9ff 00000000 00000000 00000000
CPU:             Common caps: 0383f9ff 00000000 00000000 00000000
CPU: Intel Pentium III (Coppermine) stepping 01
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (rgooch@atnf.csiro.au)
mtrr: detected mtrr type: Intel
PCI: PCI BIOS revision 2.10 entry at 0xfd99e, last bus=1
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Using IRQ router PIIX [8086/7110] at 00:07.0
PCI: Found IRQ 9 for device 00:0c.0
Limiting direct PCI/PCI transfers.
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16)
Starting kswapd
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
neofb: mapped io at d0800000
Panel is a 1024x768 color TFT display
neofb: mapped framebuffer at d0a01000
neofb v0.3.2: 6144kB VRAM, using 1024x768, 48.361kHz, 60Hz
Console: switching to colour frame buffer device 128x48
fb0: MagicGraph 256XL+ frame buffer device
pty: 256 Unix98 ptys configured
Real Time Clock Driver v1.10e
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX4: IDE controller at PCI slot 00:07.1
PIIX4: chipset revision 1
PIIX4: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xfcf0-0xfcf7, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xfcf8-0xfcff, BIOS settings: hdc:DMA, hdd:pio
hda: IBM-DARA-218000, ATA DISK drive
blk: queue c03104e0, I/O limit 4095Mb (mask 0xffffffff)
hdc: TORiSAN DVD-ROM DRD-U624, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: attached ide-disk driver.
hda: host protected area => 1
hda: 35433216 sectors (18142 MB) w/418KiB Cache, CHS=2205/255/63, UDMA(33)
Partition check:
 hda: hda1 hda2 hda4 < hda5 hda6 hda7 >
ohci1394: $Rev: 896 $ Ben Collins <bcollins@debian.org>
PCI: Enabling device 00:08.0 (0000 -> 0002)
PCI: Assigned IRQ 9 for device 00:08.0
PCI: Sharing IRQ 9 with 00:07.2
ohci1394_0: Remapped memory spaces reg 0xd1002000
ohci1394_0: Soft reset finished

Steps to reproduce:

Comment 1 Philip Armstrong 2003-10-28 08:54:21 UTC

I'm seeing very similar problems with neofb on a Thinkpad 600E (neomagic
magicgraph 256AV) fwiw. Kernel is 2.6.0-test9

Comment 2 Philip Armstrong 2004-12-06 03:14:58 UTC

Fwiw, I'm still seeing on screen corruption with neofb in 2.6.9

It's not as bad as it used to be -- heavy scrolling no longer hangs the machine
and you don't get the 'half your screen has just disappeared for good' issues --
but editing in vi is pretty much guarenteed to corrupt the display (deleting a
character with 'x' seems to cause an entire line to be currupted for instance).

Viewing webpages with links seems to cause random littering of characters all
over the place after a suiable amount of scrolling.

Machine is a Thinkpad 600E as before.

Steps to reproduce: modprobe neofb, fbcon. Start vi on a suitable text file,
delete a character with 'x'. Usually instant screen corruption.

Comment 3 Nishanth Aravamudan 2005-02-17 11:06:51 UTC

Thanks for the update, Philip. These problems still exist with 2.6.11-rc4? Would
you be willing to test patches (just verifying you still have access to hw)?

Comment 4 Adrian Bunk 2005-07-31 13:52:11 UTC

There was no answer to the question whether this issue is still present in
recent kernels.

Please reopen this bug if it is still present.