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Weird characters in virtual terminal consoles from (CTRL-ALT) F2 to F6 and over F7



Hello list,

as stated in this reddit's issue https://www.reddit.com/r/debian/comments/1pnrm5t/comment/nugj9wc/?%24deep_link=true&context=1&correlation_id=2b4b5f38-db9c-5ace-95e8-d47408cf9fae&ref=email_comment_reply&ref_campaign=email_comment_reply&ref_source=email&%243p=e_as&_branch_match_id=1529734982500663144&utm_medium=Email+Amazon+SES&_branch_referrer=H4sIAAAAAAAAA31O2U7DMBD8mvQtCc0BDVKEkFB%2Fw%2FKxSbb40tppygvfzqaFVyRbmp2dmZ0l55he65rAGMyVjLGy6D%2FrNr4VTdfGEYRMB4aBcEYvrVjJjsvuKtr3ojnz27at%2BvXr4Jgg%2FgYUSs%2BAKQc%2BJ4bH6Mn1mVGkoCw4sWFexBUpr5ysg0%2FBQmJwBQ58bCXL%2FTpfhk3v51q%2B2DedAYhib1q0H5lWKJpntme4ZSaO94kIrMwYvEDDZKM61U%2FtqTRq0GUvNZRDDzx2L93TSU%2FDJPcUgonF4CTuhe7VBUG0X4%2Bd0NJFibP%2FV5TCShr%2BJIdv5oAI%2FSwUhS0BjWdkLtx%2BACEnHTd%2FAQAA

there is a bug since last kernel update.

My virtual consoles from tty2 to tty6 are covered with the copyright symbol. I can still log in to the terminal although everything is illegible. After logging in, I did an ls -a command to my directory. The output is in color. The copyright symbols is obscuring the text. Please have a look at the attachment.

Switching back to older kernel the bug disappears.

linux kernel 5.10.0-36-amd64 NO BUG

linux kernel 5.10.0-37-amd64 BUG

Here is the diff from the two kernel configuration files:

diff -Nru /boot/config-5.10.0-36-amd64 /boot/config-5.10.0-37-amd64
--- /boot/config-5.10.0-36-amd64    2025-09-29 13:28:35.000000000 +0200
+++ /boot/config-5.10.0-37-amd64    2025-12-11 18:55:57.000000000 +0100
@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 5.10.244 Kernel Configuration
+# Linux/x86 5.10.247 Kernel Configuration
 #
 CONFIG_CC_VERSION_TEXT="gcc-10 (Debian 10.2.1-6) 10.2.1 20210110"
 CONFIG_CC_IS_GCC=y
@@ -25,7 +25,7 @@
 # CONFIG_COMPILE_TEST is not set
 CONFIG_LOCALVERSION=""
 # CONFIG_LOCALVERSION_AUTO is not set
-CONFIG_BUILD_SALT="5.10.0-36-amd64"
+CONFIG_BUILD_SALT="5.10.0-37-amd64"
 CONFIG_HAVE_KERNEL_GZIP=y
 CONFIG_HAVE_KERNEL_BZIP2=y
 CONFIG_HAVE_KERNEL_LZMA=y
@@ -2379,9 +2379,7 @@
 CONFIG_BLK_DEV_RAM=m
 CONFIG_BLK_DEV_RAM_COUNT=16
 CONFIG_BLK_DEV_RAM_SIZE=16384
-CONFIG_CDROM_PKTCDVD=m
-CONFIG_CDROM_PKTCDVD_BUFFERS=8
-# CONFIG_CDROM_PKTCDVD_WCACHE is not set
+# CONFIG_CDROM_PKTCDVD is not set
 CONFIG_ATA_OVER_ETH=m
 CONFIG_XEN_BLKDEV_FRONTEND=m
 CONFIG_XEN_BLKDEV_BACKEND=m

Please let me know how to proceed further.


Regards,

Gianluca Renzi

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Attachment: kernel-bug-vtconsole.png
Description: PNG image


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